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Fluid Suction In Jointed Pipes

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#1 johnscotland

johnscotland

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Posted 12 January 2015 - 09:41 AM

I am currently a student undergoing a project. the project involves two converging pipes with different diameters and pressures. a small diameter pipe intersects a large bore pipe at 30 degrees. both pipes flow in the same direction. the dilemma i face is understanding if the small pipe will be subject to suction as the large pipe flows at three times the pressure. 

Also will the small diameter pipe be capable of flowing into the large pipe or will there be a forced filling of the small pipe. 

a sketch of the problem is attached. 

Any help will be much appreciated.

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#2 MTumack

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Posted 12 January 2015 - 12:26 PM

Consider the following scenario; you have a balloon which you blow into and pinch the end. You have now a high pressure zone inside the balloon, and a low pressure zone outside the balloon... if you let go of the balloon what happens?

 

Now consider one of the most basic equations of fluid mechanics, the Bernoulli equation:

 

Constant = (pressure/specific weight) + Height + ((velocity)^2/(2*gravity))

 

So I implore you, what do you think happens?






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